diff --git a/Src/Base/AMReX_ParmParse.H b/Src/Base/AMReX_ParmParse.H
index 5cc72e42fb..27d93eb67a 100644
--- a/Src/Base/AMReX_ParmParse.H
+++ b/Src/Base/AMReX_ParmParse.H
@@ -1067,14 +1067,14 @@ public:
     //! Make Parser using given string `func` as function body and `vars` as
     //! variable names. Constants known to ParmParse will be set. It's a
     //! runtime error, if there are unknown symbols in `func`.
-    Parser makeParser (std::string const& func,
-                       Vector<std::string> const& vars) const;
+    [[nodiscard]] Parser makeParser (std::string const& func,
+                                     Vector<std::string> const& vars) const;
 
     //! Make IParser using given string `func` as function body and `vars`
     //! as variable names. Constants known to ParmParse will be set. It's a
     //! runtime error, if there are unknown symbols in `func`.
-    IParser makeIParser (std::string const& func,
-                         Vector<std::string> const& vars) const;
+    [[nodiscard]] IParser makeIParser (std::string const& func,
+                                       Vector<std::string> const& vars) const;
 
     /**
     * \brief Construct an initial ParmParse object from the argc and argv